[多选题]在供电质量要求中，下列属于电能质量要求的有（）。-我要搜题网

[判断题]蓄电池液面过低,可用矿泉水添加。

[不定项选择题]共用题干 Hypertension Drugs Found to Cut Risk of Stroke
Australian doctors declared Monday that a cocktail of simple antihypertensive drugs can lower the risk of patients suffering a repeat stroke by more than a third.This is the result of their research.______（46)
Strokes kill 5 million people a year,and more than 15 million suffer non-fatal strokes that of-ten leave them with useless limbs,slurred speech and other serious disabilities._______(47)
An international six-year study of 6,100 patients directed from Sydney University found that by taking two blood pressure-lowering drugs,the risk of secondary strokes can be reduced by up to 40 percent.Even taking one of the commonly available drugs can cut the risk by a third,the study said .The drugs are the diuretic indapamide and the ACE inhibitor perindopril,better known by its brand name Coversyl._______(48)They even found that the risk of another stroke could be cut by three quarters among the one-in-ten patients who had suffered a cerebral hemorrhage,the worst type of stroke,where there is direct bleeding into the brain,
_______(49)“If most of those patients were able to get access to this treatment,it would result in maybe the avoidance of haff a million strokes a year,”the professor told Australia's ABC Radio.
_______(50)“What we have shown for the first time is that it does not really matter what your blood pressure is;if you have had a stroke,then lowering blood pressure will produce large benefits,to begin with—even for people whose blood pressure is average or below average,”he said.
McMahon said the Milan gathering had heralded the research as a“major breakthrough in the care of patients with strokes—perhaps the biggest step forward that we have made in the last cou-ple of decades”. ______（50)
A.A stroke can happen to anyone anyone at any moment.
B.Stephen McMahon,who presented the research at the Milan congress of the European Society of Hypertension,said about 50 million people were alive who had suffered at least one stroke.
C.One in five stroke survivors goes on to have a second,often fatal,stroke within five years of the first.
D.McMahon said doctors had long known that lowering the blood pressure of those with hy- pertension could help prevent strokes.
E.The research,presented at a medical conference in Italy over the weekend,has been valued highly as a major breakthrough in stroke prevention.
F.The combination was effective even in patients who did not have high blood pressure,the researchers said.

[多选题]在供电质量要求中，下列属于电能质量要求的有（ ）。A.供电电压允许偏差的范围B.供电电源C.三相供电电压允许的不平衡度D.供电电压允许的波动和闪变

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[多选题]在供电质量要求中，下列属于电能质量要求的有（）。
A.供电电压允许偏差的范围
B.供电电源
C.三相供电电压允许的不平衡度
D.供电电压允许的波动和闪变